<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>创建新元素</title>
    <script>
        window.onload = function () {
            var div = document.createElement('div')
            var massage = document.createTextNode('Hello World!')
            div.appendChild(massage)
            document.body.appendChild(div)
        }
    </script>
</head>

<body>

</body>

</html>